<template>
  <div id="home">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
<!--    固定的tabContol-->
    <tab-control :titles="['流行', '新款', '精选']"
                 @tabClick="tabClick"
                 ref="tabControl1"
                 class="tab-control-fix"
                 v-show="isTabFixed" />
    <scroll class="content"
            ref="scroll"
            :probe-type="3"
            @scroll="contentScroll"
            :pull-up-load="true" @pullingUp="loadMore">
      <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad"/>
      <recommend-view :recommends="recommends"/>
      <Feature-view/>
      <tab-control :titles="['流行', '新款', '精选']"
                   @tabClick="tabClick"
                    ref="tabControl2"/>
      <goods-list :goods="showGoods"/>
    </scroll>

    <back-top @click.native="backClick" v-show="isShowBackTop"/>

  </div>
</template>

<script>
  import HomeSwiper from "@/views/home/childComps/HomeSwiper";
  import RecommendView from "@/views/home/childComps/RecommendView";
  import FeatureView from "@/views/home/childComps/FeatureView";

  import NavBar from "@/components/common/navbar/NavBar";
  import TabControl from "@/components/content/tabControl/TabControl";
  import GoodsList from "@/components/content/goods/GoodsList";
  import Scroll from "@/components/common/scroll/Scroll";

  import {getHomeMultidata, getHomeGoods} from "@/network/home";
  import {itemListenerMixin} from "@/common/mixin";
  import {TOP_DISTANCE} from "@/common/const";
  import {backTopMixin} from "@/common/mixin";

  export default {
    name: "Home",
    components: {
      HomeSwiper,
      RecommendView,
      FeatureView,
      NavBar,
      TabControl,
      GoodsList,
      Scroll,
    },
    mixins: [itemListenerMixin, backTopMixin],
    data() {
      return {
        banners: [],
        recommends: [],
        goods: {
          'pop': {page: 0, list: []},
          'new': {page: 0, list: []},
          'sell': {page: 0, list: []}
        },
        currentType: 'pop',
        isShowBackTop: false,
        tabOffetTop: 0,
        isTabFixed: false,
        saveY: 0,
      }
    },
    computed: {
      showGoods() {
        return  this.goods[this.currentType].list
      },
    },
    created() {
      // 请求多个数据
      this.getHomeMultidata()
      // 请求商品数据
      this.getHomeGoods('pop')
      this.getHomeGoods('new')
      this.getHomeGoods('sell')

    },
    mounted() {
    },
    // 进入
    activated() {
      this.$refs.scroll.scrollTo(0, this.saveY, 0)
      this.$refs.scroll.refresh()
    },
    // 离开
    deactivated() {
      // 1、保存Y值
      this.saveY = this.$refs.scroll.getScrollY()
      // 2、取消全局监听
      this.$bus.$off('itemImageLoad', this.itemImgListener)
    },
    methods: {
      /**
        * 事件监听相关方法
        */
      debounce(func, delay) {
        let timer = null
        return function (...args) {
          if(timer) clearTimeout(timer)

          timer = setTimeout(() => {
            func.apply(this, args)
          }, delay)
        }
      },
      tabClick(index) {
        switch (index){
          case 0:
            this.currentType = 'pop'
            break
          case 1:
            this.currentType = 'new'
            break
          case 2:
            this.currentType = 'sell'
            break
        }
        this.$refs.tabControl1.currentIndex = index
        this.$refs.tabControl2.currentIndex = index
      },
      contentScroll(position) {
        // 判断BackTop是否显示
        this.isShowBackTop = (-position.y) > TOP_DISTANCE
        // 2.决定tabControl是否吸顶
        this.isTabFixed = (-position.y) > this.tabOffetTop
      },
      loadMore() {
        this.getHomeGoods(this.currentType)

        this.$refs.scroll.scroll.refresh()
      },
      swiperImageLoad() {
        this.tabOffetTop = this.$refs.tabControl2.$el.offsetTop;
      },
      /**
       * 网络请求相关方法
       */
      getHomeMultidata() {
        getHomeMultidata().then(res => {
          // console.log(res);
          this.banners = res.data.banner.list;
          this.recommends = res.data.recommend.list;
        })
      },
      getHomeGoods(type) {
        const page = this.goods[type].page + 1
        getHomeGoods(type, page).then(res => {
          this.goods[type].list.push(...res.data.list)
          this.goods[type].page += 1

          this.$refs.scroll.finishPullUp()
        })
      }

    }
  }
</script>

<style scoped>
  #home {
    position: relative;
    /*padding-top: 44px;*/
    padding-bottom: 44px;
    height: 100vh;
  }

  .home-nav {
    background-color: var(--color-tint);
    color: #fff;
    font-weight: 700;
    z-index: 9;

    /*position: fixed;*/
    /*top: 0;*/
    /*left: 0;*/
    /*right: 0;*/
  }

  .content {
    position: absolute;
    top: 44px;
    bottom: 49px;
    left: 0;
    right: 0;
    /*height: 100%;*/
    overflow: hidden;
  }

  .tab-control-fix {
    position: relative;
    z-index: 9;
  }
</style>
